[3] He was also drafted at the last minute to stand in North Fermanagh; original Sinn Féin nominee George Irvine lost a pan-nationalist nominating convention to an Irish Parliamentary Party candidate and decided that he would therefore withdraw.

[4] In the event, his only opponent in North Fermanagh was from the Irish Unionist Party; O'Shiel took 47.9% of the vote, narrowly missing out on election.

[5] O'Shiel stood unsuccessfully for Sinn Féin in Fermanagh and Tyrone at the 1921 Northern Ireland general election,[6] then afterwards devoted his time to activities in the South.

He served as assistant legal advisor to the Irish government in 1922–23,[7] and as director of the North Eastern Boundary Bureau from 1922 to 1925.

[5] His daughter, Eda Sagarra, wrote a biography of her father: Kevin O'Shiel: Northern Nationalist and Irish-State Builder (issued 2013).